Electrical apparatus



(No Model.) 2 Sheets-Sheet 1.

v C. D. BAKER & L. G. BRONSON.

ELEGTRIGAL APPARATUS.

No. 417,217. Patented Dec. 17-, 1889.

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(No Model.) 2 Sheets-Sheet 2.

G. D. BAKER & L. G. BRONSON ELECTRICAL APPARATUS.

No. 417,217. Patented Dec. 17, 1889.

A AIwmmM UNITED STATES PATENT OFFICE.

CIIAUNCEY D. BAKER AND LE\VIE G. BRONSON, OF CHICAGO, ILLINOIS.

ELECTRICAL APPARATUS.

SPECIFICATION forming part of Letters Patent 110.417.5317, dated December 17, 1889.

Application filed April 30, 1888- Renewed August 8, 1889. Serial No. 320,141. (No model.)

' Apparatus, of which the following is a specification, reference being had to the accompanying drawings, in which- Figure 1 is a side elevation, the armature being in .the position which it occupies when themain circuit is open. Fig. 2 is a plan. Fig. 3 is a section at line of Fig. 1, looking to the right. Fig. at is a side elevation showing the armature in the position which it occupies when the main circuit is closed and the conditions are normal. Fig. 5 is a side elevation showing the position of the armature when the main circuit is closed and the intensity of the current has been, from any cause, materially increased over its normal condition.

Our improvement is primarily designed to be used with relay-instrumentssuch as are used in connection with burglar-alarms and other electrical devicesfor the purpose of bringing into operation an independent set of electrical devices when there is a material derangement of or change in the current of the main circuit. Such derangement or change mayoccur either as a consequence of the opening of the circuit, or by short-circuiting the main circuit or grounding part of it.

The leading object of our invention is to construct a relay so that one magnet and one armaturewill do the work, which we accomplish by means, of an armature composed of two parts hinged or jointed together, the entire armature being also hinged at its lower end, as usual, whereby either end of the armature can be brought into connection with contact-points, as illustrated in the drawings and hereinafter described. In the drawings, A represents a magnet of ordinary construction and arranged in a main circuit, as usual. a a are bindingposts for wires in such main circuit.

b h are binding-posts for the Wires of a local circuit.

0 is a metal plate secured to the base 13.

(Z is a yoke, the lower end of which is hinged at r to the plate 0. This piece d is in fact a part of the armature. O is the other part of the armature, the lower end of which is pivoted at s between the two arms of the yoke d, as shown in Fig. 3.

D is a post secured to the base 13.

E is'a fork secured to the upper end of the post D. One of the arms e of this fork is provided with an adjustable contact-piece f, which is made of rubber or other non-conducting material. The other arm g of this fork is provided with an adjustable metallic contact-piece h.

F is another fork, similar to the fork E, and it is also secured to the post D. One arm 7; of this fork is provided with a contact-piece j, which is made of rubber or other non-conducting material, and the other arm of this fork F is provided with a metallic contactpiece Z.

m is an arm supported by the post D, and carrying at its outer end a screw n.

p is a coiled spring, one end of which is connected with the part 0 of the armature near its lower end, and the other end of the spring is connected with the screw 01. in such manner that the tension of the spring can be adjusted by turning such screw. A wire passes from the lower end of the binding-post b to the post D, and another wire from the plate 0 to the other binding-post b of the local circuit.

The operation is as follows: Suppose the main circuit to be closed and the conditions normal. The armature will be drawn toward the magnet, but its upper end will come in contact with the non-conducting contact-piece f, and the lower end, being held by the tension of the spring 1), the same having been properly adjusted, will be held in contact with the non-conducting contact-piece j, the armature thus being held away from the contact-points in the local circuit, as shown in Fig. 4. If from any cause the main line is opened, the action of the magnet on the armature will cease, and the tension of the spring p will draw the armature over, and its upper end will come in contact with the contactpiece 71, as shown in Fig. 1, and then the local circuit will be completed through the binding-post b, the post D, the contact-piece h, the armature, the plate 0, and post 1), the armature then being in the position shown in Fig. 1. If from any cause the intensity of the current be materially increased, the action of the magnet will draw the armature into the position shown in Fig. 5, the upper end of the armature then being in contact with the non-conducting piece f and the lower end being in contact with the metallic contactpiece Z, the action of the magnet then overcoming the tension of the spring 17, and the armature being permitted to assume the position shown in Fig. 5 by reason of the two joints 0' s. In this position the local circuit will be completed throughthe binding-post Z), post D, contact-piece l, the armature, the plate (2, and binding-post b. When the parts are in the position shown in Fig. 4, the armature is held away from both of the metallic contact-points in the local circuit, which will then be inoperative. By means of this jointed armature the upper end under certain conditions can be brought into contact with the non-conducting piece f and the lower end he at the same time in contact with the non-conducting piece j. Under other conditions the upper end of the armature can be brought into contact with the metallic contact-piece h; and under still other conditions the upper end of the armature can be brought into contact with the non-conducting piece f and its lower end into contact with the metallic contact-piece Z, and by means of this jointed armature and a single magnet we are able to accomplish the desired result.

Our improvement can be used in connection with telegraphic fire-alarm apparatus, with duplex telegraphic instruments, with printing-telegraphs, and vwith other electric apparatus.

Ve do not limit ourselves to the specific way shown and described of hinging the two parts of the armature together, as they may be hinged together in various ways and at Various points.

\Vhat we claim as new, and desire to secure by Letters Patent, is

An armature composed of two pieces, as C d, hinged together, the part (Z being also hinged at its lower end, in combination with a non-conducting contact-point f, so located that the upper end of the part 0 of the armature can be brought into contact with such contact-point), and a non-conducting contactpoint j, so located that the part c? of the armature can come in contact with it, and two conducting contact-points h Z, substantially as and for the purposes specified.

CI-IAUNCEY D. BAKER. LEWIE G. BRONSON. Witnesses:

ALBERT H. ADAMS, HARRY T. Joxns. 

